if your motor rotates counter-clockwise from the shaft end

and draining of hydronic heating loops

making it a staple for light commercial and standard residential boiler applications

if your diagnostic testing indicates the furnace control is not receiving a signal from the flame sensor

Replacement is necessary if you observe a bulging top

York S1-2702-316P/A Limit Switch 340793-762 if your motor rotates counter-clockwiseThe York S1 2702 316P A Limit Switch is a critical safety component engineered for precise thermal regulation within York and Johnson Controls HVAC systems. This HVAC high limit switch functions as a primary safety cut out, monitoring heat exchanger temperatures to prevent overheating conditions that can lead to equipment failure or hazardous operation. As a direct replacement for S1 2702 3161 A, as well as the S1 2702 316P and S1 2702 316PA models,